Double emulsion production in glass capillary microfluidic device: Parametric investigation of droplet generation behaviour

Seyed Ali Nabavi, Goran T. Vladisavljević, Sai Gu, Ekanem E. Ekanem

Research output: Contribution to journalArticle

69 Citations (Scopus)

Abstract

A three-phase axisymmetric numerical model based on Volume of Fluid-Continuum Surface Force (VOF-CSF) model was developed to perform parametric analysis of compound droplet production in three-phase glass capillary devices that combine co-flow and countercurrent flow focusing. The model predicted successfully generation of core-shell and multi-cored double emulsion droplets in dripping and jetting (narrowing and widening) regime and was used to investigate the effects of phase flow rates, fluid properties, and geometry on the size, morphology, and production rate of droplets. As the outer fluid flow rate increased, the size of compound droplets was reduced until a dripping-to-jetting transition occurred. By increasing the middle fluid flow rate, the size of compound droplets increased, which led to a widening jetting regime. The jetting was supressed by increasing the orifice size in the collection capillary or increasing the interfacial tension at the outer interface up to 0.06N/m. The experimental and simulation results can be used to encapsulate CO2 solvents within gas-permeable microcapsules.

Original languageEnglish
Pages (from-to)183-196
Number of pages14
JournalChemical Engineering Science
Volume130
DOIs
Publication statusPublished - 7 Jul 2015

Keywords

  • Core-shell droplets
  • Dripping regime
  • Flow focusing
  • Glass capillary microfluidics
  • Jetting regime
  • Solvent encapsulation

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering
  • Applied Mathematics

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